C# 登录窗口与主窗口

//程序入口
using System;
using System.Collections.Generic;
using System.Windows.Forms;

namespace huiyi
{
    static class Program
    {
        /// <summary>
        /// 应用程序的主入口点。
        /// </summary>
        [STAThread]
        static void Main()
        {
            Application.EnableVisualStyles();
            Application.SetCompatibleTextRenderingDefault(false);
            Application.Run(new mainform());
        }

    }
}


//主窗口的代码
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;

namespace huiyi
{
    public partial class mainform : Form
    {
        public mainform()
        {
            InitializeComponent();
            welcomefrom welcome = new welcomefrom();

            if (welcome.ShowDialog() == DialogResult.OK)
            {
                this.DialogResult = DialogResult.OK;
 
             }

        }

      

        private void mainform_Load(object sender, EventArgs e)
        {
            MessageBox.Show("主窗体显示");
        }

        private void softclose_Click(object sender, EventArgs e)
        {
            this.Close();
        }

      
    }

  
}

//登录窗口的代码
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Timers;

namespace huiyi
{
    public partial class welcomefrom : Form
    {
        System.Timers.Timer timer1 = new System.Timers.Timer();  //时间控件
        public welcomefrom()
        {
            InitializeComponent();
           
            timer1.Elapsed += new ElapsedEventHandler(OnTimedEvent);

        }

        public void OnTimedEvent(object source, ElapsedEventArgs e)
        {
            this.DialogResult = DialogResult.OK;
            timer1.Enabled = false;
            timer1.Stop();
            this.Close();
        }

        private void welcomefrom_Load_1(object sender, EventArgs e)
        {
            //      5秒后关闭欢迎窗口

           
            timer1.Interval = 5000;  //5秒后，显示主窗口
            timer1.Enabled = true;
            timer1.Start();
        }
    }
}